refactor!: remove jest condition

[sxzz]

Description

Since Vite have migrated to Vitest #8076 and removed Jest, so some conditions can be removed.

previously #8783

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[sapphi-red]

/ecosystem-ci run

[vite-ecosystem-ci]

📝 Ran ecosystem CI: Open

suite	result
analogjs	✅ success
astro	✅ success
histoire	✅ success
ladle	✅ success
laravel	✅ success
marko	✅ success
nuxt	✅ success
nx	✅ success
previewjs	✅ success
qwik	❌ failure
rakkas	✅ success
sveltekit	✅ success
unocss	✅ success
vike	✅ success
vite-plugin-pwa	✅ success
vite-plugin-react	✅ success
vite-plugin-react-pages	✅ success
vite-plugin-react-swc	✅ success
vite-plugin-svelte	✅ success
vite-plugin-vue	✅ success
vite-setup-catalogue	✅ success
vitepress	✅ success
vitest	❌ failure

[sapphi-red]

#5197 adds it but it's not quite clear how to reproduce it today to see if it's fixed.

I guess jest wasn't working even with --experimental-vm-modules in #5197 because of a bug in jest. Also the segfault error should be fixed by Node 20.8.0.
https://github.com/nodejs/node/blob/main/doc/changelogs/CHANGELOG_V20.md#rework-of-memory-management-in-vm-apis-with-the-importmoduledynamically-option